The size of

8. [2pt] Match the object with the size scale.
(E.g., if the first corresponds to B, and the others to C, enter BCCCCC)
1) Thickness of a window pane.
2) Diameter of a twig.
3) Diameter of a proton.
4) Diameter of a hair.
5) Size of an oil molecule
6) Size of a robin.